#include <stdio.h> 
#include <sys/types.h> 
#include <unistd.h> 

int main() 
{ 
	int ret = fork(); 
	if(ret < 0) { perror("fork"); return 1; } 
	else if(ret == 0)
	{ 
		//child 
		printf("I am child : %d!, ret: %d\n", getpid(), ret); 
	}
	else
	{ 
		//father 
		printf("I am father : %d!, ret: %d\n", getpid(), ret); 
	} 
	sleep(1); 
	
	return 0; 
}
